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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Seismic activity that accompanied the effusive and explosive eruptions during the 2004-2005 period at Volcan de Colima, Mexico
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Seismic activity that accompanied the effusive and explosive eruptions during the 2004-2005 period at Volcan de Colima, Mexico

机译：在2004年至2005年期间，墨西哥火山科利马火山伴随爆发性和爆炸性爆发的地震活动

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摘要

Volcan de Colima is considered the most active in Mexico. A period of large eruptive activity occurred in 2004-2005. It began as a swarm of long-period events (LPs) in late September 2004, indicating the onset of growth of a new lava dome in its crater. Subsequently, avalanches of incandescent material and pyrodastic flows during a period of approximately 2 months occurred. Then, the activity became more explosive with moderate explosions. Finally, swarms of LPs accompanied the magma ascent and extrusion of small domes and vulcanian explosions with pyroclastic flows in 2005. This eruptive period was investigated with a continuous seismic signal study, cross-correlation of LPs and autoregressive analysis of monochromatic LPs. For the vast majority of the explosions, an increase in the rate of seismic energy was observed with the Seismic Spectral Energy Measurement (SSEM) from 1 to 3 Hz, before each explosive event. This increase in energy is proportional to the increase in the rate of LPs, probably as a result of an increase in the emission rate. Applying the material failure forecasting method (FFM) and using SSEM inverse of parameter, the time of the explosions is estimated as the time when the adjusted line reaches the null value. We observe a systematic delay of a few hours between the real time of occurrence of the explosions and the estimated time. This suggests that more complex processes than pure damaging of the plug occur before the explosions. The swarms associated with the large explosions include a large proportion of LPs with similar waveforms. They form a dozen of families which stay during the whole period of activity and which indicate repetitive sources. Some of the families are active only before the explosions and could therefore be used as early warning. Monochromatic LP events occurred during this period, some of them just some hours before an explosion. However, no clear relationship between their occurrence and the explosions could be found.
机译：Volcan de Colima被认为是墨西哥最活跃的地方。在2004-2005年期间，发生了大规模爆发活动。它始于2004年9月下旬的大量长期事件（LP），表明火山口中一个新的熔岩穹顶开始生长。随后，在大约2个月的时间内发生了白炽物质和焦岩流的雪崩。然后，活动变得更加爆炸性，适度爆炸。最后，在2005年，LP蜂群伴随着小圆顶的岩浆上升和挤压以及火山碎屑流的火山爆发。通过连续的地震信号研究，LP的互相关性和单色LP的自回归分析研究了这个爆发期。对于绝大多数爆炸，在每次爆炸事件发生之前，通过地震频谱能量测量（SSEM）观察到的地震能量速率都从1 Hz增加到3 Hz。能量的增加与LPs速率的增加成比例，这可能是排放速率增加的结果。应用材料故障预测方法（FFM）并使用SSEM逆参数，将爆炸时间估计为调整线达到零值的时间。我们观察到实际发生爆炸与估计时间之间存在系统的延迟，时间为几个小时。这表明，在爆炸发生之前，发生了比纯粹损坏塞子更复杂的过程。与大爆炸有关的群包括大部分具有相似波形的LP。他们组成了十几个家庭，他们在整个活动期间都停留着，这表明了重复的来历。一些家庭仅在爆炸发生前才活跃，因此可以用作预警。在此期间发生了单色LP事件，其中一些事件发生在爆炸前几个小时。但是，没有发现它们的发生与爆炸之间的明确关系。

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2011年第2期|p.30-46|共17页
  • 作者

    R. Arambula-Mendoza; P. Lesage; C. Valdes-Gonzalez; N.R. Varley; G. Reyes-Davila; C. Navarro;

  • 作者单位

    Posgrado en Gencias de la Tierra, Institute de Geofisica, UN AM, dudad Universitaria, Dei Coyoacdn, C.P. 045102, Mexico D.F., Mexico;

    Institut des Sciences de la Terre, CNRS, Universite de Savoie, 73376 Le Bourget-du-Lac Cedex, France;

    Institute de Geofisica, UNAM, Ciudad Universitaria, Del. Coyoacan, C.P. 045102, Mexico D.F., Mexico;

    Facultad de Ciencias, Universidad de Colima, Av. Bernal Diaz del Castillo No. 340, Col. Villas San Sebastian, C.P. 28045, Colima, Colima, Mexico;

    Centro Universitario de Estudios e Investigaciones en Vulcanologia, Av. Bernal Diaz del Castillo No. 340, Col. Villas San Sebastidn, C.P. 28045, Colima, Colima, Mexico;

    Centro Universitario de Estudios e Investigaciones en Vulcanologia, Av. Bernal Diaz del Castillo No. 340, Col. Villas San Sebastidn, C.P. 28045, Colima, Colima, Mexico;

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  • 正文语种 eng
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  • 关键词

    long-period events (LPs); material failure forecasting method (FFM); cross-correlation; volcan de colima;

    机译：长期事件（LP）;物料故障预测方法（FFM）;互相关火山火山;

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